Her paintings have been exhibited in Paris, London, New York, Tokyo and Milan. But in her old age, renowned Aboriginal artist Kathleen Ngale lives on a mattress outdoors, unable to walk, kept warm during cold desert winter nights by about a dozen dogs who sleep alongside her.Ms Ngale, aged about 87, lives at Camel Camp where she was born, an outstation in the remote Utopia region of Central Australia, about 260 kilometres north-east of Alice Springs.